Marktest is leading in Top 10K Sites and Top 100K Sites.
WebProspector has better usage coverage in more websites categories. Including Business & Industry, Marketing & Advertising, Internet & Telecom, Arts & Entertainment and 29 other categories.
Marktest is leading in Newspapers and Music & Audio.
WebProspector is leading in most countries, including Germany, United States, Switzerland, Russia and 12 other countries.
Marktest is leading in Portugal and Brazil.